I just finished with a new build and im getting a CPU Temperature of 63 degrees celsius.. I have a Intel Q6600 Quad Core CPU and a Thermaltake / Silent 775D / Socket 775 / Copper Core / Copper Heatpipes / CPU Fan.
I have applied thermal paste (Zerotherm Thermal Paste) on the CPU and the heatsink and it is still 63 to 67 degrees celsius. What should i do?
EDIT: The thermal paste is a little dry after applying it...

At Idle the temp on that chip is about 62 C so you are not that high for operations in games.

You can "Lap" the heatsink and see if that helps bring the temp down a bit!

How to Lap a Heatsink

Even though that heatsink/fan may have come as matched to the chip it is probably on the low end for cooling....Change it to a better rated heatsink/fan combo....or replace the fan with a faster one!

Other options would be to make sure there is clean clear airflow throughout the computer. If you built it make sure ALL fans are moving the air in the right direction(be surprised at how many reverse fans so they slow air movement!)

Duct the air from around the chip so that the fan is pulling only cool outside air and not preheated air from within the computer.

If your thermal paste is dry, it probably won't make good thermal contact. I'd try replacing with fresh paste to see if that helps. The purpose of the paste is to fill the tiny crevaces and imprefections on the surface of the heatsink. Unless the heatsink is really warped, machining it won't do much for you. Cheaper to buy a bigger 'sink.

But 63C doesn't sound too bad.